Question: When did Ngũgĩ wa Thiong'o begin working at the University of Nairobi?
Paraphrase: On what date did Ngugi wa Thiong'o start her job at the University of Nairobi?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q302910 p:P108 ?s . ?s ps:P108 wd:Q649998 . ?s pq:P580 ?value}